As Carl Tawn suggests, some column types don't export, like Attachment and Multivalued Fields, OLE fields, hyperlinks, etc. I'm not sure about Memo, but it wouldn't surprise me if those did not export either.

When you do the export you have the Options button ... there's not much there, but you should review those to make sure the options are set correctly (they're very obvious, like Export Data, Export Schema, etc).

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